@kiddoleknocker If you guys have been having an amicable arrangement until now, if you need to go the legal route you can, but perhaps he will see the wisdom of the fact that going from 0 overnights to a week full of overnights is a bit much. Why not propose start with 1 night a week and go from there see if he will understand that gradual is better for your son and also for him to realize how much work it will take and have time to adjust